JRC JMR-92 Series Field Service Manual page 323

Step 4 Operation check
After completing the replacement work, turn On the safety switch and check operation by
following the procedure below.
(1) Turn On the Display unit. After the countdown is completed, start transmission and check
that the radar image appears without error. Check that the motor does not make any
abnormal sound when it starts to rotate, while it is rotating, or when it stops.
This completes motor driver circuit board replacement.
Remove the four screws.
Motor driver circuit board
4-103 Chapter 4 Replacement procedure